8. How many of the following gases at STP are less dense than air at STP?

NH₃, He, Kr, and F₂
(A) 1 ;
(B) 2 ;
(C) 3 ;
(D) 4 ;
(E) 0

4. Which of the following compounds has the same percent composition by mass as styrene, C8H8? (A) acetylene, C2H2; (B) benzene, C6H6; (C) cyclobutadiene, C4H4; (D) a-ethyl naphthalene, ; (E) all of these.

5. When the equation NH3 + O2 → NO + H2O is balanced with the smallest set of integers, the sum of the coefficients is (A) 4 ; (B) 12; (C) 14 ; (D) 19 ; (Ε) 24

6. What is the net ionic equation for the reaction of aqueous sodium hydroxide with aqueous nitric acid? (A) (B)(C)(D)(E)

7. Which of the following reactions does not involve oxidation-reduction? (A) CH4 + 2O2 → 2H2O + CO2 ; (B) Mg + 2HI → MgI2 + H2; (C) 2Na + 2H2O → 2NaOH + H2 (D) MnO2 + 4HI → I2 + 2H2O + MnI2 ; (E) LiOH + HCl → H2O + LiCl

9. The ratio of average kinetic energies per ideal gas molecule (H2: SO2) at the same temperature and pressure. (S: 32; O: 16; H: 1) (A) 1.0; (B) 0.18 ; (C) 32 ; (D) 5.6; (E) none of these.

10. Consider the equation 2A(g) ⇌ 2B(g) + C(g). At a particular temperature, K = 1.6 × 104. If you mixed 5.0 mol B, 0.10 mol C, and 0.0010 mol A in a 1-L container, in which direction would The reaction initially proceeds? (A) To the left. ; (B) To the right. ; (C) The above mixture is the equilibrium mixture. ; (D) We cannot tell from the information given. ; (E) none of these.

11. The acids HC2H3O2 and HF are both weak, but HF is a stronger acid than HC2H3O2. HCl is a strong acid. Order the following according to base strength. (A) (B) (C) (D)(E) none of these.

12. Calculate in a 0.012 M solution of HCN, (A) (B)(C) (D) (E)

13. Methyl orange is an indicator with a . Its acid form, , is red, while its base form, In, is yellow. At pH 6.0, the indicator will be (A) red.; (B) orange. ; (C) yellow. ; (D) blue. ; (E) not enough information.

14. Suppose you add 45 J of heat to a system, let it do 10. J of expansion work, and then return the system to its initial state by cooling and compression. Which statement is true for this process? (A) ΔΗ ＜ ΔΕ ; (B) ∆H = 70. J ; (C) The change in the internal energy for this process is zero. (D) The work done in compressing the system must exactly equal the work done by the system in the expansion step. ; (E) All the statements are false.

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